Notice for participants who consented to be part of the Registry before January 2013 Linkage to the data held by the Health and Social Care Information Centre To be part of the Registry and its studies, the participants need to give their consent that information from their medical records can be extracted and analysed. The data in the medical records are usually sufficient but on some occasions relevant data may be missing if participants received care in other NHS Trusts which are not part of the Registry’s network of centres. Participants also need to be followed up over time to find out if they have developed any comorbid conditions or had ITP treatment elsewhere, even if they are no longer at the centre where they were initially registered. With a determination to capture these important data and therefore improve data completeness, the Registry applied to the Health and Social Care Information Centre to use their Data Linkage Service. This means that the Registry will be able to obtain Hospital Episodes Statistics about their interaction with the NHS, such as inpatient admissions, outpatient clinics, A&E visits and Critical Care admissions. The Registry does collect all this data through its data collection activities but required the assistance of the HSCIC to ensure that all is being captured. In December 2012, the application was made for the Data Linkage Service. While the HSCIC was considering the application, the Registry’s consent form was being updated to ensure that new participants gave their consent that their data can be obtained from the HSCIC. The new consent form was approved by the National Research Ethic Service in January 2013 and used from then on. The previous consent form did request for participants’ data to be extracted from their medical records but the Confidentiality Advisory Group (CAG) had to approve if this data collection can be extended to the data managed by the HSCIC. An application under section 251 was made and approval was granted by CAG. Data from HSCIC was then received in January 2014. Participants who were enrolled on the previous consent forms had to be given the opportunity to object to their data being received by the Registry from the HSCIC. If you are participant who was enrolled prior to January 2013 and you do not wish the Registry to obtain your data from the HSCIC please write to us at Data Manager/Study Coordinator Room 201 Pharmacy and Pathology Building 80 Newark Street London E1 2ES